Abstract: A method of providing nuclear particle identification for e, ?, ?, and p of up to about 4 to about 5 GeV/c using an improved Threshold Cerenkov Detector With Radial Segmentation (TCDRS), comprising: A) Allowing particles of e, ?, ?, and p to impinge on three concentric shells of twenty-five radiator tubes; wherein: i) an outer shell of radiator tubes is filled with water and a wavelength shifter to provide a first index of refraction; ii) a middle shell of the radiator tubes is filled with mineral oil to provide a second index of refraction higher than the first index of refraction; and iii) a center shell of the radiator tubes is filled with mineral oil and a wave length shifter to provide a third index of refraction higher than the second index of refraction; B) Obtaining blue light from three concentric shells of twenty-five radiator tubes segmented radially into three different materials; and the ultraviolet Cerenkov light produced in the radiators is absorbed by a wavelength shifter and emitted as blue l